How to Reduce Your Risk of Long COVID

There is no way to soften this: the only way to avoid Long COVID is to avoid COVID in the first place.

Long COVID is a possible consequence of COVID infection. Each infection carries some risk, and that risk does not disappear with repeat infections. Some studies suggest the burden of risk can accumulate over multiple infections, even if the risk from any one infection varies by person, variant, vaccination status, and health history.

The good news is that infection risk is not random. You have real, practical ways to lower it. The goal is not perfection; it is shifting the odds in your favor.

Avoiding Infection: The Things That Work

Wear a well-fitting respirator.
For indoor public spaces, this is one of the most powerful tools an individual can control. COVID spreads through the air, especially indoors, and a respirator works by filtering the air you breathe. Cloth masks and loose surgical masks are much less protective. A genuine N95, KN95, KF94, or better respirator is the right category.

Fit matters as much as filtration. A high-quality respirator that leaks around the nose or cheeks will not protect nearly as well as one that seals to your face. A formal fit test is best, but even a basic seal check helps: when you breathe in and out, you should not feel air escaping around the edges.

Pay attention to transmission levels.
COVID comes in waves. When transmission is high, the chance that someone near you is infectious rises sharply. Wastewater monitoring is one of the better real-time tools because it does not depend on people testing at home or reporting results. When wastewater levels are high, that is the time to tighten precautions: mask indoors, avoid crowded spaces, and move optional gatherings outside.

Move activities outdoors.
Outdoor air disperses viral particles far better than indoor air. Outdoor transmission can still happen, especially in close face-to-face conversation or dense crowds, but the risk is much lower than in enclosed spaces. When you have the choice, outdoor meals, visits, meetings, and exercise are safer than indoor versions.

Improve indoor air.
When you cannot be outside, make indoor air more like outdoor air. Open windows when possible, increase ventilation, and use HEPA air purifiers or well-built Corsi-Rosenthal boxes. Better air does not make a room risk-free, but it lowers the amount of virus available to breathe in.

Test before higher-risk contact.
Rapid antigen tests are imperfect, but a positive result is meaningful. Testing is especially useful before seeing vulnerable people, after an exposure, or when symptoms appear. A single negative rapid test does not prove you are not infectious; repeat testing over 48 hours is more informative.

Vaccination: Helpful, but Not a Shield

Vaccination belongs on this list, but it should be described honestly.

COVID vaccines meaningfully reduce the risk of severe acute illness, hospitalization, and death. They also appear to reduce the risk of Long COVID compared with being unvaccinated. But the reduction is partial. Vaccination does not reliably prevent infection, and it does not eliminate Long COVID risk.

So vaccination is best understood as one layer: valuable, especially for preventing severe outcomes, but not a substitute for avoiding infection. Anyone who thinks vaccination alone can protect you from Long COVID is simply wrong.

Medications During Acute Infection

One question is whether treatment during the acute infection can reduce the chance of Long COVID. This research is still developing, but two options are worth knowing about.

Metformin has the strongest signal.
In the randomized COVID-OUT trial, a two-week course of metformin started early in COVID infection was associated with about a 41% lower risk of Long COVID. The effect appeared larger when started within the first few days of symptoms. Metformin is generic, inexpensive, and widely used. If you've used it, please consider adding a review to our database here.

The caveats matter. Long COVID was a secondary outcome, and the trial enrolled adults who were overweight or obese, so we do not know whether the same effect applies to everyone. Later analyses and additional trial data are supportive, but metformin is still not a universal standard recommendation for Long COVID prevention. It is a reasonable thing to ask a doctor about promptly if you test positive, especially if you fit the studied population.

Paxlovid is more uncertain for Long COVID prevention.
Paxlovid is an important antiviral for reducing severe acute COVID in people at higher risk. Whether it prevents Long COVID is less clear. Some observational studies have found a small reduction in Long COVID risk, while other large analyses have found no meaningful overall reduction except possibly in higher-risk groups. Trials of Paxlovid for already-established Long COVID have also been disappointing. If you've used it, please consider adding a review to our database here.

That does not mean Paxlovid is useless. If you qualify for it because you are at higher risk for severe COVID, it can be very important. But the case for taking it specifically to prevent Long COVID is weaker than the case for metformin, and Paxlovid has significant drug-interaction issues that require medical review.

The Bottom Line

Stack the layers. No single measure is perfect, but they combine: avoid crowded indoors when transmission is high, wear a well-fitting respirator, choose outdoor settings, improve ventilation and filtration, test, consider vaccination, and ask a clinician quickly about treatment options if you get infected.

Avoiding Long COVID is mostly about avoiding infection, and reducing the severity and duration of infection when it happens. None of this is fully within anyone’s control, and getting infected is not a moral failure. But these tools genuinely shift the odds, and the odds are worth shifting.